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https://issues.apache.org/jira/browse/HIVE-9112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14270975#comment-14270975
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Ted Xu commented on HIVE-9112:
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Thanks [~xuefuz], it is a bug of constant propagation optimizer.
I'm running the unit tests and hopefully will get the patch ready soon.
> Query may generate different results depending on the number of reducers
> ------------------------------------------------------------------------
>
> Key: HIVE-9112
> URL: https://issues.apache.org/jira/browse/HIVE-9112
> Project: Hive
> Issue Type: Bug
> Reporter: Chao
> Assignee: Ted Xu
>
> Some queries may generate different results depending on the number of
> reducers, for example, tests like ppd_multi_insert.q, join_nullsafe.q,
> subquery_in.q, etc.
> Take subquery_in.q as example, if we add
> {noformat}
> set mapred.reduce.tasks=3;
> {noformat}
> to this test file, the result will be different (and wrong):
> {noformat}
> @@ -903,5 +903,3 @@ where li.l_linenumber = 1 and
> POSTHOOK: type: QUERY
> POSTHOOK: Input: default@lineitem
> #### A masked pattern was here ####
> -108570 8571
> -4297 1798
> {noformat}
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